Window lock



March 4, 1952 Filed July 19, 1947 s. J. clTso 2,587,695

WINDOW Loox 2 SHEETS-SHEET l S. J. CITSC WINDOW LOCK Maich 4, 1952 2SHEETS-SHEET 2 Filed July 19, 1947 INVENTOR I STEVEN J. CITSO PatentedMar. 4, 1952 UNITED STATES PATENT OFFICE My invention is directed toself locking locks for window sash and other slidably mounted closureelements.

It is an important object of my invention to provide novel releasablewindow locks having spring pressed retractable latchbolts of the classdescribed which are adapted to snap into locked position when theclosure is moved into closed position and which have novel guard meansactuable upon closing movement to hold and releasably lock the slidablelatch bolt into locked position.

A further object of my invention is the provision of self locking locksfor slidable closures which have a novel combination of parts includingan angular guard adapted to be moved and 'dropped over the latch bolt toprevent its unauthorized retraction and which is actuated to closingmovement by movement of the locking element of the bolt into closedposition; said guard being also adapted to limit the opening movement ofthe slidable sash.

Other and further important objects of my invention will be apparentfrom the following description and appended claims.

This invention, (in one preferred form) is illustrated in theaccompanying drawing bearing numerals of reference contained in theaccompanying specification.

Fig. 1 is a partially cross sectional and partially elevational enlargedView of my lock illustrating its mounting on adjoining sections of twowindow sash frames.

Fig. 2 is an enlarged cross section of the lock illustrating the lockbolt in retracted position.

Fig. 3 is a partially side elevational and partially cross sectionalview, illustrating the lower sash frame in position upraised to thelimit pery mitted by the guard of my device.

Fig. 4 is a cross sectional view taken on a plane indicated by line 4-4of Fig. 3.

Referring to the drawings reference numeral IU designates a lowerslidable window sash frame whose outer edge face Illa is beveledasindicated,

6 Claims. (Cl. 292-175) of screws I'I, one of which is shown in Fig. 3.The end wall I6 has an enlarged preferably rectangular opening thereinin which is slidably mounted a beveled stud I8 of slidable, retractablelatch bolt I9. The upper face 2d of stud I8 is also slightly beveledtoward its end as illustrated in Figs. 1 and 2. The handle I9a of latchbolt I9 is bent substantially at right angles as indicated in Figs. land 2 and said bolt I9 carries an abutment member I9b. A compressiblecoil spring 2| is mounted about bolt I9 between wall I5 and stud I8 asshown in the drawing. A channel-like metal bracket 22 having oppositelyextending apertured integral feet 23 is secured by screws 24 to theupper face of the upper rail of sash frame Il as shown in Fig. 4. Theopposite side portions of brackets 22 are apertured at their upper endsand a pin 25 is mounted therein, said pin passing thru aligned aperturesof ears 2'I of trip lock 26 and forming a pivot for said trip lock. Thehinged end portion of trip lock 26 is bent angularly and terminates inan edge face 26a. The free end portion of trip lock 26 is bent at rightangles to form a stop element 26h to limit either the upward movement ofthe lower sash or downward movement of the upper sash, or part openingmovements of both sashes.

Pivoted on the intermediate portion of bracket 22 by means of pivot 28is a vertically slotted dog 21a. whose projecting free end is reducedand beveled as shown in Figs. l, 2 and 3. The slot 29 in dog 21a iswider than the thickness of the upwardly extending portion of abendable, yieldable retaining member 30 whose lower angularly bent endis mounted in a transverse slot in the base of bracket 22 and impingedbeneath an upwardly struck intermediate element 3l which is shownintegral with the bracket base in Fig. 4. The face of the upper portionof yieldable retaining member 30 is adapted to frictionally engage theedge face 26a of trip lock 26 when said lock 26 is upraised position andsuch frictional engagement will normally hold said lock 26 in upperposition when either sash frame is in partially open position.

When either the lower sash frame is lowered or the upper sash framemoved up, the lower beveled face of stud I8 will-slidably engage thebeveled edge of dog 21a to impart a slight downward movement to dog 21a,which in turn slightly bends the yieldable, retaining member 30 awayfrom bracket 22 and away from pane I3. the upper end of trip lock 26 isheavier (and its lower edge face 26a being thereby released from L saidhousing;

3 the engagement of retaining member 30) the said trip lock 25 willpivot and drop to the dotted line position shown in Fig. 1 so that thestop element 2Gb overlies the handle I9a of latch bolt I9 to prevent itsbeing forced into open position by unauthorized manipulation.

When a person on the inside of the house desires to bring either of thesash frames towards each other (namely open either thereof) he willmanually vlift theitrip lock 26 into upper position and retract bolt I9from locking engagement and either pull the lower sash frame upwardly orthe upper sash frame downwardly until the face 20 of stud I8 strikes thestop element` 26h of trip lock 2B to thereby stop any further openingmovement of either sash frame..

An important novel advantage of myconstruction and its operation is thatno separate manual movement is necessary to place the trip lock-2S intolocking position as .this is automatically accomplished .in r`-thedescribed manner vupon the .sliding of. either.or both sash frames intoAclosed position.

When .the user `desires to fully open either sash frame or both thereofbeyond the limit. normally .permitted by stop element 2Gb the latch boltI9 is T.withdrawn against the action of its spring and :the'stud I8 ofbolt I9 willpass by oravoid enf gaging .the .stop element 26h as eithersash frame is moved to-a more than normal open position.

`As many changes could be made in the above construction, and manyVapparently widely different-embodiments of my invention, within theyscope-of the claims, .constructed without dep-arti ing from the-spiritor scope thereof, it is intended that all matter contained in theaccompanying specication shall .be interpreted as illustrative and notin a limiting sense.

1 claim:

1. In a self-locking latch for windows, a bracket secured .to .an uppersash frame; an angularly bent trip lock` pivoted on said bracket;

.an aperturedhousing secured on the lowersash frame; a spring pressedlatch bolt slidably lmounted in said housing and having a studat .oneend of said latch bolt; a slotted dog pivoted on said bracket; -abendable retaining member extending through said slotted dog, saidretaining member in unbent position normally .engaging `an end of saidtrip lock whenthe window .is open toA thereby hold said trip lock inunlocked 4Vposition, thefclosuie of the window being ladapted to cause`engagement of said stud and said dog to cause said dog to pivot `tothereby bend said retaining member to cause disengagement thereof Afromthe endof .said trip .lock to thereby cause gravity pivoting of saidtrip lock into locking position. Y y

2...In a vsafe-locking latch for windows, a bracketsecured Vtoan upper.sash frame; an angularly lbent trip lock pivoted on said bracket; ahousing secured on a lower sash frame; a spring pressed latch boltslidably mounted in a slotted dog `pivoted `on said bracket; -aretaining member adjacent said bracket and extending upwardly throughthe slot r`of. said dog, said retaining member being adapted to engagesaid trip lock .to hold said trip lock in unlocked position, theengagement of said latch bolt and said dog during closure of the sashframes being adapted to cause movement .of said .retaining member fromengagement with s aidtrip lock to thereby permit said trip lock .topivot. to .locked position.

3. In a safe-locking latch for windows, a bracket mountable on an outersash frame; a trip lock pivoted on said bracket; an apertured housingsecured on an inner sash frame; a spring pressed latch bolt slidablymounted in said housing; a beveled stud on one end of said bolt; aslotted dog pivoted on said bracket; an upwardly extending retainingmember extending through the slot of said dog and at selected positionsof the sash viframes engaging an end-of said trip lock, at otherpositions of said sash frames said stud engaging said dog to causedownward moverment of said dog to cause it to pivot to thereby causemovement of said retaining member from engagement with said trip lock tothereby permit '.gravityzpivoting of said trip lock to locked position.

4.*In a safety lock for window sash frames having an apertured housingon one of said sash frames; a slidable retractable bolt mounted in saidhousing andhaving a stud at .one end; a springfor normally pressing saidbolt into locking position; a bracket mountable on the other ofsaid`sash frames; Aa trip lock pivoted on.said bracket and adapted whenlowered to prevent `retraction of said bolt; a slotted dog pivoted to.dog land said stud .to permit said studto move outwardly to be.retained .from further opening movement .bysaid .dog .until manualretraction of said bolt.

5, In a safety lock for window sash frames having va lpassaged housingand a retractable latch bolt slidable therein 'for one of saidsashframes; a spring for movingsaid bolt into locking position; a bracketonthe second sash frame; a trip lock pivoted onsaid bracket; v.a dogpivoted on. said bracketand adapted toretain said latch bolt to locksaid sash frames from movement; a retaining member engageable by saiddog :and normally holdingsaid trip lock'in open position; said bolt atselected ypositions Acoming into engagement with said dog to pivot sameto cause disengagement of said retaining member and said trip lock topermit said trip lock 'to drop into latch bolt lockingpositions andprevent retraction of .said latch'bolt vfrom unauthorized positions.

6. In a device for locking .a slidable'latch`-bolt against retraction; abracket adapted to be secured on a slidable closure; a lock pivoted onsaid bracket and when lowered being adapted to lock abolt againstretraction; a retaining member normally applying pressure against saidlock to retain it in open position; a'dog pivoted on said Noreferencescited.

